Janet Yellen’s first appearance before Congress was notable as much for her style — a slower speaking pace than Ben Bernanke, and far easier to understand than Alan Greenspan — as substance. But the Federal Reserve chairwoman did make notable policy points. Here are a few.

Last week a pair of Chicago Federal Reserve economists asserted that the creation of as few as 80,000 jobs a month could push down the U.S. unemployment rate. Well, that’s not the end of the story. Another analysis by Wall Street firm Goldman Sachs suggests the number is much higher, perhaps 130,000 to 140,000 new jobs a month.

The correct answer is not some dry academic dispute. The speed at which the unemployment rate falls could have a huge impact on bond prices and stock markets, enriching those investors who make the right call.